PORTAGE LEARNING BIOCHEM MODULE 6 EXAM QUESTIONS & ANSWERS COMPLETE AND WELL EXPLAINED AND VERIFIED BY EXPERTS 100% CORRECT | LATEST UPDATE 2024| GRADED A+ ALL YOU NEED TO PASS YOUR EXAMS [ALREDY PASSED]

PORTAGE LEARNING BIOCHEM MODULE 6 EXAM QUESTIONS & ANSWERS COMPLETE AND WELL EXPLAINED AND VERIFIED BY EXPERTS 100% CORRECT | LATEST UPDATE 2024| GRADED A+ ALL YOU NEED TO PASS YOUR EXAMS [ALREDY PASSED] Composition of bases heterocyclic organic compounds containing N Purine structure 2 rings fused together Purine bases Adenine and Guanine Pyramidine structure single ring Pyramidine bases Cytosine, thymine (DNA), uracil (RNA) Distinction between thymine and uracil Thymine has an extra methyl group (looks like an antenna) RNA sugar D-ribose; carbon 2 has an -OH group DNA sugar 2-deoxy-D-ribose; Carbon 2 has -H Nucleoside structure base covalently bonded to ribose or 2-deoxyribose Site of base + sugar bonding anomeric carbon of sugar and N of base primary structure of nucleic acids covalent bonding of phosphate groups and sugar to form backbone 5' end phosphate group is located at carbon 5 of sugar 3' end hydroxyl group (-OH) is located at carbon 3 of sugar What dictates primary structure of DNA? Order of bases from 5' to 3' Oligonucleotide A chain of 50 or fewer nucleotides DNA secondary structure Any stable structure taken up by some or all of the nucleotides, such as a double helix DNA tertiary structure massive, more complex folding structures Discovery of DNA double helix structure 1953, Watson & Crick